Galleria floats over my navigation bar.

I have a navigation bar that keeps opening behind galleria, How Do I set Galleria back? I have changed the .galleria-container to have a z-index of -1. This works, however all the functionality is lost. Can't click arrow, thumbnails or information. Please Help!

I solved my own problem by placing the navigation bar, in an absolute div, creating a blank div in the exact place as the absolute div to keep the spacing. Than creating a DIV group for the Gallery to sit in. I had to set a z-index in the nav bar higher than the gallery.